Please help with the area and perimeter of a trap3zoid, please

The square pyramid has a volume of 441 cubic inches. what is the value of x? 1/7x is the height x is the base

Asquare picture with sides of 32 inches is to be mounted on a square mat with sides of 52 inches. find the area of the mat that will remain uncovered by the picture.

On #16 : explain how factoring a trinomial, ax^2+ bx+ c, when a does not equal 1 different from factoring a trinomial when a = 1.